There are multiple different types of colligative properties. They include vapor pressure, boiling point, and freezing point. A colligative property is a property of a solvent that depends on the number of solute particles dissolved in it, but not on the identity or nature of those solute particles.
For freezing point, as solutes are dissolved, the solute particles disrupt the freezing process as the solvent particles try to form solid crystals. This change of the freezing process results in a lower freezing point for the solution. With boiling point, the more solute in the solution, the higher the boiling point is. As you add solute it add energy to the solution causing the resulting boiling point having to be higher.